1070984-66-5Relevant articles and documents
Heterolytic cleavage of dihydrogen by frustrated Lewis Pairs derived from α-(dimesitylphosphino)ferrocenes and B(C6F5) 3
Huber, Dominique P.,Kehr, Gerald,Bergander, Klaus,Froehlich, Roland,Erker, Gerhard,Tanino, Soichiro,Ohki, Yasuhiro,Tatsumi, Kazuyuki
, p. 5279 - 5284 (2009/03/11)
Treatment of the α-dimethylamino[3]ferrocenophane system 3 with methyl iodide followed by dimesitylphosphine (Mes2PH) gave the α-(dimesitylphosphino)[3]ferrocenophane 5. This forms a frustrated Lewis pair [5/8] with B(C6F5)3 (8) that rapidly reacts with dihydrogen under ambient conditions to probably give the phosphonium cation/hydrido borate anion salt [5-H+/H-8-]. This, however, is unstable under the applied reaction conditions with regard to replacement of the newly formed phosphonium leaving group at the ferrocenophane a-position for hydride from the [HB(C6F5)3 -] counteranion to eventually yield the unfunctionalized [3]ferrocenophane product (10) and Mes2PH· B(C 6F5)3 (11) - both characterized by independent syntheses. Analogously, Ugi's amine (6) was converted to (1-(dimesitylphosphino) -ethyl)ferrocene (7). The frustrated pair [7/8] consumes dihydrogen under similar conditions to yield the reduction products ethylferrocene (14) and Mes2PH · B(C6F5)3 (11).
